reweight a given item (and adjust ancestor
weights as needed)
-i mapfn --reweight recalculate all bucket weights
+ -i mapfn --create-simple-rule name root type mode
+ create crush rule <name> to start from <root>,
+ replicate across buckets of type <type>, using
+ a choose mode of <firstn|indep>
+ -i mapfn --create-replicated-rule name root type
+ create crush rule <name> to start from <root>,
+ replicate across buckets of type <type>
+ --device-class <class>
+ use device class <class> for new rule
+ -i mapfn --remove-rule name
+ remove the specified crush rule
Options for the display/test stage
[--outfn|-o outfile]
specify output for modified crush map
+
$ crushtool --help-output
data output from testing routine ...
absolute_weights